Which of the following sets of elements does not belong to same group ?
Important Questions on The p-Block Elements-Group 14 (Carbon Family)
Germanium exists only in traces.
The order of electronegativity of is
All group elements are available in solid state
(i) Boron has high density and good electrical conductivity.
(ii) isotope metal borides are useful as protective shields in nuclear industry.
(iii) Borax and boric acid are used in the manufacture of glasses.
(iv) Orthoboric acid is toxic and hence not useful in antiseptic solutions.
Give a reason for the following:
Inert gases do not form ions.
The following table represents the elements and the atomic number. With reference to this, answer the following using only the alphabets given in the table.
| Element | Atomic number |
Which element has an electron affinity zero?
Name the following element:
- A trivalent metal used to make light tools.
Tin in state acts as reducing agent while lead in state acts as strong oxidising agent.
Silicon exists as both and forms.
The hybridisation of carbon in fullerene is .
Among and lowest melting point is for .
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags.
Reason (R): Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning.
In the light of the above statements, choose the correct answer from the options given below:
Name the following element:
- An alkaline earth metal present in group and period .
Consider the following radioactive decays
I. and
II.
In which case group of parent and daughter elements remains unchanged.
